screen.c 70.3 KB
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/* Metacity X screen handler */

/* 
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 * Copyright (C) 2001, 2002 Havoc Pennington
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 * Copyright (C) 2002, 2003 Red Hat Inc.
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 * Some ICCCM manager selection code derived from fvwm2,
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 * Copyright (C) 2001 Dominik Vogt, Matthias Clasen, and fvwm2 team
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 * Copyright (C) 2003 Rob Adams
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 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 * 02111-1307, USA.
 */
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#include <config.h>
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#include "screen.h"
#include "util.h"
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#include "errors.h"
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#include "window.h"
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#include "frame.h"
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#include "prefs.h"
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#include "workspace.h"
#include "keybindings.h"
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#include "stack.h"
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#include "xprops.h"
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#include "compositor.h"
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#ifdef HAVE_SOLARIS_XINERAMA
#include <X11/extensions/xinerama.h>
#endif
#ifdef HAVE_XFREE_XINERAMA
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#include <X11/extensions/Xinerama.h>
#endif

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#include <X11/Xatom.h>
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#include <locale.h>
#include <string.h>
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#include <stdio.h>
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static char* get_screen_name (MetaDisplay *display,
                              int          number);

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static void update_num_workspaces  (MetaScreen *screen);
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static void update_focus_mode      (MetaScreen *screen);
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static void set_workspace_names    (MetaScreen *screen);
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static void prefs_changed_callback (MetaPreference pref,
                                    gpointer       data);
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#ifdef HAVE_STARTUP_NOTIFICATION
static void meta_screen_sn_event   (SnMonitorEvent *event,
                                    void           *user_data);
#endif

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static int
set_wm_check_hint (MetaScreen *screen)
{
  unsigned long data[1];

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  g_return_val_if_fail (screen->display->leader_window != None, 0);
  
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  data[0] = screen->display->leader_window;

  XChangeProperty (screen->display->xdisplay, screen->xroot,
                   screen->display->atom_net_supporting_wm_check,
                   XA_WINDOW,
                   32, PropModeReplace, (guchar*) data, 1);
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  return Success;
}

static int
set_supported_hint (MetaScreen *screen)
{
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#define N_SUPPORTED 68
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  Atom atoms[N_SUPPORTED];
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  atoms[0] = screen->display->atom_net_wm_name;
  atoms[1] = screen->display->atom_net_close_window;
  atoms[2] = screen->display->atom_net_wm_state;
  atoms[3] = screen->display->atom_net_wm_state_shaded;
  atoms[4] = screen->display->atom_net_wm_state_maximized_vert;
  atoms[5] = screen->display->atom_net_wm_state_maximized_horz;
  atoms[6] = screen->display->atom_net_wm_desktop;
  atoms[7] = screen->display->atom_net_number_of_desktops;
  atoms[8] = screen->display->atom_net_current_desktop;
  atoms[9] = screen->display->atom_net_wm_window_type;
  atoms[10] = screen->display->atom_net_wm_window_type_desktop;
  atoms[11] = screen->display->atom_net_wm_window_type_dock;
  atoms[12] = screen->display->atom_net_wm_window_type_toolbar;
  atoms[13] = screen->display->atom_net_wm_window_type_menu;
  atoms[14] = screen->display->atom_net_wm_window_type_dialog;
  atoms[15] = screen->display->atom_net_wm_window_type_normal;
  atoms[16] = screen->display->atom_net_wm_state_modal;
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  atoms[17] = screen->display->atom_net_client_list;
  atoms[18] = screen->display->atom_net_client_list_stacking;
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  atoms[19] = screen->display->atom_net_wm_state_skip_taskbar;
  atoms[20] = screen->display->atom_net_wm_state_skip_pager;
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  atoms[21] = screen->display->atom_net_wm_icon_name;
  atoms[22] = screen->display->atom_net_wm_icon;
  atoms[23] = screen->display->atom_net_wm_icon_geometry;
  atoms[24] = screen->display->atom_net_wm_moveresize;
  atoms[25] = screen->display->atom_net_active_window;
  atoms[26] = screen->display->atom_net_wm_strut;
  atoms[27] = screen->display->atom_net_wm_state_hidden;
  atoms[28] = screen->display->atom_net_wm_window_type_utility;
  atoms[29] = screen->display->atom_net_wm_window_type_splash;
  atoms[30] = screen->display->atom_net_wm_state_fullscreen;
  atoms[31] = screen->display->atom_net_wm_ping;
  atoms[32] = screen->display->atom_net_wm_pid;
  atoms[33] = screen->display->atom_net_workarea;
  atoms[34] = screen->display->atom_net_showing_desktop;
  atoms[35] = screen->display->atom_net_desktop_layout;
  atoms[36] = screen->display->atom_net_desktop_names;
  atoms[37] = screen->display->atom_net_wm_allowed_actions;
  atoms[38] = screen->display->atom_net_wm_action_move;
  atoms[39] = screen->display->atom_net_wm_action_resize;
  atoms[40] = screen->display->atom_net_wm_action_shade;
  atoms[41] = screen->display->atom_net_wm_action_stick;
  atoms[42] = screen->display->atom_net_wm_action_maximize_horz;
  atoms[43] = screen->display->atom_net_wm_action_maximize_vert;
  atoms[44] = screen->display->atom_net_wm_action_change_desktop;
  atoms[45] = screen->display->atom_net_wm_action_close;
  atoms[46] = screen->display->atom_net_wm_state_above;
  atoms[47] = screen->display->atom_net_wm_state_below;
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  atoms[48] = screen->display->atom_net_wm_pid;
  atoms[49] = screen->display->atom_net_workarea;
  atoms[50] = screen->display->atom_net_showing_desktop;
  atoms[51] = screen->display->atom_net_desktop_layout;
  atoms[52] = screen->display->atom_net_desktop_names;
  atoms[53] = screen->display->atom_net_wm_allowed_actions;
  atoms[54] = screen->display->atom_net_wm_action_move;
  atoms[55] = screen->display->atom_net_wm_action_resize;
  atoms[56] = screen->display->atom_net_wm_action_shade;
  atoms[57] = screen->display->atom_net_wm_action_stick;
  atoms[58] = screen->display->atom_net_wm_action_maximize_horz;
  atoms[59] = screen->display->atom_net_wm_action_maximize_vert;
  atoms[60] = screen->display->atom_net_wm_action_change_desktop;
  atoms[61] = screen->display->atom_net_wm_action_close;
  atoms[62] = screen->display->atom_net_wm_state_above;
  atoms[63] = screen->display->atom_net_wm_state_below;
  atoms[64] = screen->display->atom_net_startup_id;
  atoms[65] = screen->display->atom_net_wm_strut_partial;
  atoms[66] = screen->display->atom_net_wm_action_fullscreen;
  atoms[67] = screen->display->atom_net_wm_action_minimize;
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  XChangeProperty (screen->display->xdisplay, screen->xroot,
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                   screen->display->atom_net_supported,
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                   XA_ATOM,
                   32, PropModeReplace, (guchar*) atoms, N_SUPPORTED);
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  return Success;
#undef N_SUPPORTED
}

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static int
set_wm_icon_size_hint (MetaScreen *screen)
{
#define N_VALS 6
  gulong vals[N_VALS];

  /* min width, min height, max w, max h, width inc, height inc */
  vals[0] = META_ICON_WIDTH;
  vals[1] = META_ICON_HEIGHT;
  vals[2] = META_ICON_WIDTH;
  vals[3] = META_ICON_HEIGHT;
  vals[4] = 0;
  vals[5] = 0;
  
  XChangeProperty (screen->display->xdisplay, screen->xroot,
                   screen->display->atom_wm_icon_size,
                   XA_CARDINAL,
                   32, PropModeReplace, (guchar*) vals, N_VALS);
  
  return Success;
#undef N_VALS
}

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static void
reload_xinerama_infos (MetaScreen *screen)
{
  MetaDisplay *display;

  display = screen->display;
  
  if (screen->xinerama_infos)
    g_free (screen->xinerama_infos);
  
  screen->xinerama_infos = NULL;
  screen->n_xinerama_infos = 0;
  screen->last_xinerama_index = 0;

  screen->display->xinerama_cache_invalidated = TRUE;
  
#ifdef HAVE_XFREE_XINERAMA
  if (XineramaIsActive (display->xdisplay))
    {
      XineramaScreenInfo *infos;
      int n_infos;
      int i;
      
      n_infos = 0;
      infos = XineramaQueryScreens (display->xdisplay, &n_infos);

      meta_topic (META_DEBUG_XINERAMA,
                  "Found %d Xinerama screens on display %s\n",
                  n_infos, display->name);

      if (n_infos > 0)
        {
          screen->xinerama_infos = g_new (MetaXineramaScreenInfo, n_infos);
          screen->n_xinerama_infos = n_infos;
          
          i = 0;
          while (i < n_infos)
            {
              screen->xinerama_infos[i].number = infos[i].screen_number;
              screen->xinerama_infos[i].x_origin = infos[i].x_org;
              screen->xinerama_infos[i].y_origin = infos[i].y_org;
              screen->xinerama_infos[i].width = infos[i].width;
              screen->xinerama_infos[i].height = infos[i].height;

              meta_topic (META_DEBUG_XINERAMA,
                          "Xinerama %d is %d,%d %d x %d\n",
                          screen->xinerama_infos[i].number,
                          screen->xinerama_infos[i].x_origin,
                          screen->xinerama_infos[i].y_origin,
                          screen->xinerama_infos[i].width,
                          screen->xinerama_infos[i].height);              
              
              ++i;
            }
        }
      
      meta_XFree (infos);
    }
  else
    {
      meta_topic (META_DEBUG_XINERAMA,
                  "No XFree86 Xinerama extension or XFree86 Xinerama inactive on display %s\n",
                  display->name);
    }
#else
  meta_topic (META_DEBUG_XINERAMA,
              "Metacity compiled without XFree86 Xinerama support\n");
#endif /* HAVE_XFREE_XINERAMA */

#ifdef HAVE_SOLARIS_XINERAMA
  /* This code from GDK, Copyright (C) 2002 Sun Microsystems */
  if (screen->n_xinerama_infos == 0 &&
      XineramaGetState (screen->display->xdisplay,
                        screen->number))
    {
      XRectangle monitors[MAXFRAMEBUFFERS];
      unsigned char hints[16];
      int result;
      int n_monitors;
      int i;

      n_monitors = 0;
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      result = XineramaGetInfo (screen->display->xdisplay,
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                                screen->number,
				monitors, hints,
                                &n_monitors);
      /* Yes I know it should be Success but the current implementation 
       * returns the num of monitor
       */
      if (result > 0)
	{
          g_assert (n_monitors > 0);
          
          screen->xinerama_infos = g_new (MetaXineramaScreenInfo, n_monitors);
          screen->n_xinerama_infos = n_monitors;
          
          i = 0;
          while (i < n_monitors)
            {
              screen->xinerama_infos[i].number = i;
              screen->xinerama_infos[i].x_origin = monitors[i].x;
	      screen->xinerama_infos[i].y_origin = monitors[i].y;
	      screen->xinerama_infos[i].width = monitors[i].width;
	      screen->xinerama_infos[i].height = monitors[i].height;

              meta_topic (META_DEBUG_XINERAMA,
                          "Xinerama %d is %d,%d %d x %d\n",
                          screen->xinerama_infos[i].number,
                          screen->xinerama_infos[i].x_origin,
                          screen->xinerama_infos[i].y_origin,
                          screen->xinerama_infos[i].width,
                          screen->xinerama_infos[i].height);              
              
              ++i;
            }
	}
    }
  else if (screen->n_xinerama_infos == 0)
    {
      meta_topic (META_DEBUG_XINERAMA,
                  "No Solaris Xinerama extension or Solaris Xinerama inactive on display %s\n",
                  display->name);
    }
#else
  meta_topic (META_DEBUG_XINERAMA,
              "Metacity compiled without Solaris Xinerama support\n");
#endif /* HAVE_SOLARIS_XINERAMA */

  
  /* If no Xinerama, fill in the single screen info so
   * we can use the field unconditionally
   */
  if (screen->n_xinerama_infos == 0)
    {
      if (g_getenv ("METACITY_DEBUG_XINERAMA"))
        {
          meta_topic (META_DEBUG_XINERAMA,
                      "Pretending a single monitor has two Xinerama screens\n");
          
          screen->xinerama_infos = g_new (MetaXineramaScreenInfo, 2);
          screen->n_xinerama_infos = 2;
          
          screen->xinerama_infos[0].number = 0;
          screen->xinerama_infos[0].x_origin = 0;
          screen->xinerama_infos[0].y_origin = 0;
          screen->xinerama_infos[0].width = screen->width / 2;
          screen->xinerama_infos[0].height = screen->height;

          screen->xinerama_infos[1].number = 1;
          screen->xinerama_infos[1].x_origin = screen->width / 2;
          screen->xinerama_infos[1].y_origin = 0;
          screen->xinerama_infos[1].width = screen->width / 2 + screen->width % 2;
          screen->xinerama_infos[1].height = screen->height;
        }
      else
        {
          meta_topic (META_DEBUG_XINERAMA,
                      "No Xinerama screens, using default screen info\n");
          
          screen->xinerama_infos = g_new (MetaXineramaScreenInfo, 1);
          screen->n_xinerama_infos = 1;
          
          screen->xinerama_infos[0].number = 0;
          screen->xinerama_infos[0].x_origin = 0;
          screen->xinerama_infos[0].y_origin = 0;
          screen->xinerama_infos[0].width = screen->width;
          screen->xinerama_infos[0].height = screen->height;
        }
    }

  g_assert (screen->n_xinerama_infos > 0);
  g_assert (screen->xinerama_infos != NULL);
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  {
    GList *tmp;

    tmp = screen->workspaces;
    while (tmp != NULL)
      {
        MetaWorkspace *space = tmp->data;

        meta_workspace_invalidate_work_area (space);
        
        tmp = tmp->next;
      }
  }
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}

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MetaScreen*
meta_screen_new (MetaDisplay *display,
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                 int          number,
                 Time         timestamp)
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{
  MetaScreen *screen;
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  Window xroot;
  Display *xdisplay;
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  XWindowAttributes attr;
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  Window new_wm_sn_owner;
  Window current_wm_sn_owner;
  gboolean replace_current_wm;
  Atom wm_sn_atom;
  char buf[128];
  Time manager_timestamp;
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  gulong current_workspace;
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  replace_current_wm = meta_get_replace_current_wm ();
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  /* Only display->name, display->xdisplay, and display->error_traps
   * can really be used in this function, since normally screens are
   * created from the MetaDisplay constructor
   */
  
  xdisplay = display->xdisplay;
  
  meta_verbose ("Trying screen %d on display '%s'\n",
                number, display->name);

  xroot = RootWindow (xdisplay, number);

  /* FVWM checks for None here, I don't know if this
   * ever actually happens
   */
  if (xroot == None)
    {
      meta_warning (_("Screen %d on display '%s' is invalid\n"),
                    number, display->name);
      return NULL;
    }

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  sprintf (buf, "WM_S%d", number);
  wm_sn_atom = XInternAtom (xdisplay, buf, False);  
  
  current_wm_sn_owner = XGetSelectionOwner (xdisplay, wm_sn_atom);

  if (current_wm_sn_owner != None)
    {
      XSetWindowAttributes attrs;
      
      if (!replace_current_wm)
        {
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          meta_warning (_("Screen %d on display \"%s\" already has a window manager; try using the --replace option to replace the current window manager.\n"),
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                        number, display->name);

          return NULL;
        }

      /* We want to find out when the current selection owner dies */
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      meta_error_trap_push_with_return (display);
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      attrs.event_mask = StructureNotifyMask;
      XChangeWindowAttributes (xdisplay,
                               current_wm_sn_owner, CWEventMask, &attrs);
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      if (meta_error_trap_pop_with_return (display, FALSE) != Success)
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        current_wm_sn_owner = None; /* don't wait for it to die later on */
    }

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  new_wm_sn_owner = meta_create_offscreen_window (xdisplay, xroot);
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  manager_timestamp = timestamp;
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  XSetSelectionOwner (xdisplay, wm_sn_atom, new_wm_sn_owner,
                      manager_timestamp);

  if (XGetSelectionOwner (xdisplay, wm_sn_atom) != new_wm_sn_owner)
    {
      meta_warning (_("Could not acquire window manager selection on screen %d display \"%s\"\n"),
                    number, display->name);

      XDestroyWindow (xdisplay, new_wm_sn_owner);
      
      return NULL;
    }
  
  {
    /* Send client message indicating that we are now the WM */
    XClientMessageEvent ev;
    
    ev.type = ClientMessage;
    ev.window = xroot;
    ev.message_type = display->atom_manager;
    ev.format = 32;
    ev.data.l[0] = manager_timestamp;
    ev.data.l[1] = wm_sn_atom;

    XSendEvent (xdisplay, xroot, False, StructureNotifyMask, (XEvent*)&ev);
  }

  /* Wait for old window manager to go away */
  if (current_wm_sn_owner != None)
    {
      XEvent event;

      /* We sort of block infinitely here which is probably lame. */
      
      meta_verbose ("Waiting for old window manager to exit\n");
      do
        {
          XWindowEvent (xdisplay, current_wm_sn_owner,
                        StructureNotifyMask, &event);
        }
      while (event.type != DestroyNotify);
    }
  
  /* select our root window events */
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  meta_error_trap_push_with_return (display);
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  /* We need to or with the existing event mask since
   * gtk+ may be interested in other events.
   */
  XGetWindowAttributes (xdisplay, xroot, &attr);
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  XSelectInput (xdisplay,
                xroot,
                SubstructureRedirectMask | SubstructureNotifyMask |
                ColormapChangeMask | PropertyChangeMask |
                LeaveWindowMask | EnterWindowMask |
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                KeyPressMask | KeyReleaseMask |
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                FocusChangeMask | StructureNotifyMask |
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#ifdef HAVE_COMPOSITE_EXTENSIONS
                ExposureMask |
#endif
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		attr.your_event_mask);
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  if (meta_error_trap_pop_with_return (display, FALSE) != Success)
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    {
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      meta_warning (_("Screen %d on display \"%s\" already has a window manager\n"),
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                    number, display->name);
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      XDestroyWindow (xdisplay, new_wm_sn_owner);
      
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      return NULL;
    }
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  screen = g_new (MetaScreen, 1);
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  screen->closing = 0;
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  screen->display = display;
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  screen->number = number;
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  screen->screen_name = get_screen_name (display, number);
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  screen->xscreen = ScreenOfDisplay (xdisplay, number);
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  screen->xroot = xroot;
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  screen->width = WidthOfScreen (screen->xscreen);
  screen->height = HeightOfScreen (screen->xscreen);
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  screen->current_cursor = -1; /* invalid/unset */
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  screen->default_xvisual = DefaultVisualOfScreen (screen->xscreen);
  screen->default_depth = DefaultDepthOfScreen (screen->xscreen);
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  screen->flash_window = None;
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  screen->wm_sn_selection_window = new_wm_sn_owner;
  screen->wm_sn_atom = wm_sn_atom;
  screen->wm_sn_timestamp = manager_timestamp;
  
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  screen->work_area_idle = 0;
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  screen->active_workspace = NULL;
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  screen->workspaces = NULL;
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  screen->rows_of_workspaces = 1;
  screen->columns_of_workspaces = -1;
  screen->vertical_workspaces = FALSE;
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  screen->starting_corner = META_SCREEN_TOPLEFT;
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  screen->showing_desktop = FALSE;
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  screen->compositor_windows = NULL;
  screen->damage_region = None;
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  screen->root_picture = None;
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  screen->trans_pixmap = None;
  screen->trans_picture = None;
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  {
    XGCValues gc_values;
    
    gc_values.subwindow_mode = IncludeInferiors;
    gc_values.function = GXinvert;
    gc_values.line_width = META_WIREFRAME_XOR_LINE_WIDTH;
    
    screen->root_xor_gc = XCreateGC (screen->display->xdisplay,
                                     screen->xroot,
                                     GCSubwindowMode | GCFunction | GCLineWidth,
                                     &gc_values);
  }
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  screen->xinerama_infos = NULL;
  screen->n_xinerama_infos = 0;
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  screen->last_xinerama_index = 0;  
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  reload_xinerama_infos (screen);
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  meta_screen_set_cursor (screen, META_CURSOR_DEFAULT);
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  if (display->no_focus_window == None)
    {
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      display->no_focus_window = meta_create_offscreen_window (display->xdisplay,
                                                               screen->xroot);

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      XSelectInput (display->xdisplay, display->no_focus_window,
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                    FocusChangeMask | KeyPressMask | KeyReleaseMask);
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      XMapWindow (display->xdisplay, display->no_focus_window);
    }
  
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  set_wm_icon_size_hint (screen);
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  set_supported_hint (screen);
  
  set_wm_check_hint (screen);
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  meta_screen_update_workspace_layout (screen);
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  /* Get current workspace */
  current_workspace = 0;
  if (meta_prop_get_cardinal (screen->display,
                              screen->xroot,
                              screen->display->atom_net_current_desktop,
                              &current_workspace))
    meta_verbose ("Read existing _NET_CURRENT_DESKTOP = %d\n",
                  (int) current_workspace);
  else
    meta_verbose ("No _NET_CURRENT_DESKTOP present\n");
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  /* Screens must have at least one workspace at all times,
   * so create that required workspace.
   */
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  meta_workspace_activate (meta_workspace_new (screen));
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  update_num_workspaces (screen);
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  set_workspace_names (screen);

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  screen->all_keys_grabbed = FALSE;
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  screen->keys_grabbed = FALSE;
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  meta_screen_grab_keys (screen);
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  screen->ui = meta_ui_new (screen->display->xdisplay,
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                            screen->xscreen);
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  screen->tab_popup = NULL;
  
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  screen->stack = meta_stack_new (screen);
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  meta_prefs_add_listener (prefs_changed_callback, screen);
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#ifdef HAVE_STARTUP_NOTIFICATION
  screen->sn_context =
    sn_monitor_context_new (screen->display->sn_display,
                            screen->number,
                            meta_screen_sn_event,
                            screen,
                            NULL);
  screen->startup_sequences = NULL;
  screen->startup_sequence_timeout = 0;
#endif
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  /* Switch to the _NET_CURRENT_DESKTOP workspace */
  {
    MetaWorkspace *space;
    
    space = meta_screen_get_workspace_by_index (screen,
                                                current_workspace);
    
    if (space != NULL)
      meta_workspace_activate (space);
  }
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  meta_compositor_manage_screen (screen->display->compositor,
                                 screen);
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  meta_verbose ("Added screen %d ('%s') root 0x%lx\n",
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                screen->number, screen->screen_name, screen->xroot);
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  return screen;
}

void
meta_screen_free (MetaScreen *screen)
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{
  MetaDisplay *display;

  display = screen->display;
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  screen->closing += 1;
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  meta_display_grab (display);

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  meta_compositor_unmanage_screen (screen->display->compositor,
                                   screen);
  
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  meta_display_unmanage_windows_for_screen (display, screen);
  
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  meta_prefs_remove_listener (prefs_changed_callback, screen);
  
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  meta_screen_ungrab_keys (screen);
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#ifdef HAVE_STARTUP_NOTIFICATION
  g_slist_foreach (screen->startup_sequences,
                   (GFunc) sn_startup_sequence_unref, NULL);
  g_slist_free (screen->startup_sequences);
  screen->startup_sequences = NULL;

  if (screen->startup_sequence_timeout != 0)
    {
      g_source_remove (screen->startup_sequence_timeout);
      screen->startup_sequence_timeout = 0;
    }
  if (screen->sn_context)
    {
      sn_monitor_context_unref (screen->sn_context);
      screen->sn_context = NULL;
    }
#endif
  
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  meta_ui_free (screen->ui);
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  meta_stack_free (screen->stack);
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  meta_error_trap_push_with_return (screen->display);
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  XSelectInput (screen->display->xdisplay, screen->xroot, 0);
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  if (meta_error_trap_pop_with_return (screen->display, FALSE) != Success)
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    meta_warning (_("Could not release screen %d on display \"%s\"\n"),
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                  screen->number, screen->display->name);
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  XDestroyWindow (screen->display->xdisplay,
                  screen->wm_sn_selection_window);
  
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  if (screen->work_area_idle != 0)
    g_source_remove (screen->work_area_idle);
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  XFreeGC (screen->display->xdisplay,
           screen->root_xor_gc);
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  g_free (screen->screen_name);
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  g_free (screen);
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  XFlush (display->xdisplay);
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  meta_display_ungrab (display);
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}

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void
meta_screen_manage_all_windows (MetaScreen *screen)
{
  Window ignored1, ignored2;
  Window *children;
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  int n_children;
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  int i;

  /* Must grab server to avoid obvious race condition */
  meta_display_grab (screen->display);

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  meta_error_trap_push_with_return (screen->display);
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  XQueryTree (screen->display->xdisplay,
              screen->xroot,
              &ignored1, &ignored2, &children, &n_children);
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  if (meta_error_trap_pop_with_return (screen->display, TRUE) != Success)
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    {
      meta_display_ungrab (screen->display);
      return;
    }
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  meta_stack_freeze (screen->stack);
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  i = 0;
  while (i < n_children)
    {
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      XWindowAttributes attrs;
      
      meta_error_trap_push_with_return (screen->display);
      
      XGetWindowAttributes (screen->display->xdisplay,
                            children[i], &attrs);
      
      if (meta_error_trap_pop_with_return (screen->display, TRUE) != Success)
        {
          meta_verbose ("Failed to get attributes for window 0x%lx\n",
                        children[i]);
        }
      else
        {
          meta_window_new_with_attrs (screen->display, children[i], TRUE,
                                      &attrs);
          
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          meta_compositor_add_window (screen->display->compositor,
                                      children[i], &attrs);
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        }
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      ++i;
    }
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  meta_stack_thaw (screen->stack);
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  meta_display_ungrab (screen->display);
  
  if (children)
    XFree (children);
}
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MetaScreen*
meta_screen_for_x_screen (Screen *xscreen)
{
  MetaDisplay *display;
  
  display = meta_display_for_x_display (DisplayOfScreen (xscreen));

  if (display == NULL)
    return NULL;
  
  return meta_display_screen_for_x_screen (display, xscreen);
}
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static void
prefs_changed_callback (MetaPreference pref,
                        gpointer       data)
{
  MetaScreen *screen = data;
  
  if (pref == META_PREF_NUM_WORKSPACES)
    {
      update_num_workspaces (screen);
    }
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  else if (pref == META_PREF_FOCUS_MODE)
    {
      update_focus_mode (screen);
    }
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  else if (pref == META_PREF_WORKSPACE_NAMES)
    {
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      set_workspace_names (screen);
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    }
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}


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static char*
get_screen_name (MetaDisplay *display,
                 int          number)
{
  char *p;
  char *dname;
  char *scr;
  
  /* DisplayString gives us a sort of canonical display,
   * vs. the user-entered name from XDisplayName()
   */
  dname = g_strdup (DisplayString (display->xdisplay));

  /* Change display name to specify this screen.
   */
  p = strrchr (dname, ':');
  if (p)
    {
      p = strchr (p, '.');
      if (p)
        *p = '\0';
    }
  
  scr = g_strdup_printf ("%s.%d", dname, number);

  g_free (dname);

  return scr;
}
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static gint
ptrcmp (gconstpointer a, gconstpointer b)
{
  if (a < b)
    return -1;
  else if (a > b)
    return 1;
  else
    return 0;
}

static void
listify_func (gpointer key, gpointer value, gpointer data)
{
  GSList **listp;
  
  listp = data;

  *listp = g_slist_prepend (*listp, value);
}

void
meta_screen_foreach_window (MetaScreen *screen,
                            MetaScreenWindowFunc func,
                            gpointer data)
{
  GSList *winlist;
  GSList *tmp;

  /* If we end up doing this often, just keeping a list
   * of windows might be sensible.
   */
  
  winlist = NULL;
  g_hash_table_foreach (screen->display->window_ids,
                        listify_func,
                        &winlist);
  
  winlist = g_slist_sort (winlist, ptrcmp);
  
  tmp = winlist;
  while (tmp != NULL)
    {
      /* If the next node doesn't contain this window
       * a second time, delete the window.
       */
      if (tmp->next == NULL ||
          (tmp->next && tmp->next->data != tmp->data))
        {
          MetaWindow *window = tmp->data;

          if (window->screen == screen)
            (* func) (screen, window, data);
        }
      
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      tmp = tmp->next;
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    }
  g_slist_free (winlist);
}

static void
queue_draw (MetaScreen *screen, MetaWindow *window, gpointer data)
{
  if (window->frame)
    meta_frame_queue_draw (window->frame);
}

void
meta_screen_queue_frame_redraws (MetaScreen *screen)
{
  meta_screen_foreach_window (screen, queue_draw, NULL);
}
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static void
queue_resize (MetaScreen *screen, MetaWindow *window, gpointer data)
{
  meta_window_queue_move_resize (window);
}

void
meta_screen_queue_window_resizes (MetaScreen *screen)
{
  meta_screen_foreach_window (screen, queue_resize, NULL);
}
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int
meta_screen_get_n_workspaces (MetaScreen *screen)
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{
  return g_list_length (screen->workspaces);
}

MetaWorkspace*
meta_screen_get_workspace_by_index (MetaScreen  *screen,
                                    int          idx)
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{
  GList *tmp;
  int i;

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  /* should be robust, idx is maybe from an app */
  if (idx < 0)
    return NULL;
  
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  i = 0;
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  tmp = screen->workspaces;
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  while (tmp != NULL)
    {
      MetaWorkspace *w = tmp->data;

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      if (i == idx)
        return w;

      ++i;
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      tmp = tmp->next;
    }

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  return NULL;
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}
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static void
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set_number_of_spaces_hint (MetaScreen *screen,
			   int         n_spaces)
{
  unsigned long data[1];

  if (screen->closing > 0)
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    return;
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  data[0] = n_spaces;

  meta_verbose ("Setting _NET_NUMBER_OF_DESKTOPS to %ld\n", data[0]);

  meta_error_trap_push (screen->display);
  XChangeProperty (screen->display->xdisplay, screen->xroot,
                   screen->display->atom_net_number_of_desktops,
                   XA_CARDINAL,
                   32, PropModeReplace, (guchar*) data, 1);
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  meta_error_trap_pop (screen->display, FALSE);
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}

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static void
update_num_workspaces (MetaScreen *screen)
{
  int new_num;
  GList *tmp;
  int i;
  GList *extras;
  MetaWorkspace *last_remaining;
  gboolean need_change_space;
  
  new_num = meta_prefs_get_num_workspaces ();

  g_assert (new_num > 0);

  last_remaining = NULL;
  extras = NULL;
  i = 0;
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  tmp = screen->workspaces;
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  while (tmp != NULL)
    {
      MetaWorkspace *w = tmp->data;

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      if (i >= new_num)
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        extras = g_list_prepend (extras, w);
      else
        last_remaining = w;
          
      ++i;
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      tmp = tmp->next;
    }

  g_assert (last_remaining);
  
  /* Get rid of the extra workspaces by moving all their windows
   * to last_remaining, then activating last_remaining if
   * one of the removed workspaces was active. This will be a bit
   * wacky if the config tool for changing number of workspaces
   * is on a removed workspace ;-)
   */
  need_change_space = FALSE;
  tmp = extras;
  while (tmp != NULL)
    {
      MetaWorkspace *w = tmp->data;

      meta_workspace_relocate_windows (w, last_remaining);      

      if (w == screen->active_workspace)
        need_change_space = TRUE;
      
      tmp = tmp->next;
    }

  if (need_change_space)
    meta_workspace_activate (last_remaining);

  /* Should now be safe to free the workspaces */
  tmp = extras;
  while (tmp != NULL)
    {
      MetaWorkspace *w = tmp->data;

      g_assert (w->windows == NULL);
      meta_workspace_free (w);
      
      tmp = tmp->next;
    }
  
  g_list_free (extras);
  
  while (i < new_num)
    {
      meta_workspace_new (screen);
      ++i;
    }
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  set_number_of_spaces_hint (screen, new_num);

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  meta_screen_queue_workarea_recalc (screen);
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}
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static void
update_focus_mode (MetaScreen *screen)
{
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  /* nothing to do anymore */ ;
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}

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void
meta_screen_set_cursor (MetaScreen *screen,
                        MetaCursor  cursor)
{
  Cursor xcursor;

  if (cursor == screen->current_cursor)
    return;

  screen->current_cursor = cursor;
  
  xcursor = meta_display_create_x_cursor (screen->display, cursor);
  XDefineCursor (screen->display->xdisplay, screen->xroot, xcursor);
  XFreeCursor (screen->display->xdisplay, xcursor);
}
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void
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meta_screen_ensure_tab_popup (MetaScreen *screen,
                              MetaTabList type)
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{
  MetaTabEntry *entries;
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  GList *tab_list;
  GList *tmp;
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  int len;
  int i;
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  if (screen->tab_popup)
    return;

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  tab_list = meta_display_get_tab_list (screen->display,
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                                        type,
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                                        screen,
                                        screen->active_workspace);
  
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  len = g_list_length (tab_list);
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  entries = g_new (MetaTabEntry, len + 1);
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  entries[len].key = NULL;
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  entries[len].title = NULL;
  entries[len].icon = NULL;
  
  i = 0;
  tmp = tab_list;
  while (i < len)
    {
      MetaWindow *window;
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      MetaRectangle r;
      
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      window = tmp->data;
      
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      entries[i].key = (MetaTabEntryKey) window->xwindow;
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      entries[i].title = window->title;
      entries[i].icon = window->icon;
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      entries[i].blank = FALSE;
      
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      if (!window->minimized || !meta_window_get_icon_geometry (window, &r))
        meta_window_get_outer_rect (window, &r);
      
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      entries[i].x = r.x;
      entries[i].y = r.y;
      entries[i].width = r.width;
      entries[i].height = r.height;
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      /* Find inside of highlight rectangle to be used
       * when window is outlined for tabbing.
       * This should be the size of the east/west frame,
       * and the size of the south frame, on those sides.
       * on the top it should be the size of the south frame
       * edge.
       */
      if (window->frame)
        {
          int south = window->frame->rect.height - window->frame->child_y -
            window->rect.height;
          int east = window->frame->child_x;
          entries[i].inner_x = east;
          entries[i].inner_y = south;
          entries[i].inner_width = window->rect.width;
          entries[i].inner_height = window->frame->rect.height - south * 2;
        }
      else
        {
          /* Use an arbitrary border size */
#define OUTLINE_WIDTH 5
          entries[i].inner_x = OUTLINE_WIDTH;
          entries[i].inner_y = OUTLINE_WIDTH;
          entries[i].inner_width = window->rect.width - OUTLINE_WIDTH * 2;
          entries[i].inner_height = window->rect.height - OUTLINE_WIDTH * 2;
        }
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      ++i;
      tmp = tmp->next;
    }
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  screen->tab_popup = meta_ui_tab_popup_new (entries, 
                                             screen->number,
                                             len,
                                             5, /* FIXME */
                                             TRUE);
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  g_free (entries);

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  g_list_free (tab_list);
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  /* don't show tab popup, since proper window isn't selected yet */
}
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void
meta_screen_ensure_workspace_popup (MetaScreen *screen)
{
  MetaTabEntry *entries;
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  int len;
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  int i;
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  MetaWorkspaceLayout layout;
  int n_workspaces;
  int current_workspace;
  
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  if (screen->tab_popup)
    return;

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  current_workspace = meta_workspace_index (screen->active_workspace);
  n_workspaces = meta_screen_get_n_workspaces (screen);
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  meta_screen_calc_workspace_layout (screen, n_workspaces,
                                     current_workspace, &layout);

  len = layout.grid_area;
  
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  entries = g_new (MetaTabEntry, len + 1);
  entries[len].key = NULL;
  entries[len].title = NULL;
  entries[len].icon = NULL;

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  i = 0;
  while (i < len)
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    {
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      if (layout.grid[i] >= 0)
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        {
          MetaWorkspace *workspace;
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          workspace = meta_screen_get_workspace_by_index (screen,
                                                          layout.grid[i]);
          
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          entries[i].key = (MetaTabEntryKey) workspace;
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          entries[i].title = meta_workspace_get_name (workspace);
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          entries[i].icon = NULL;
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          entries[i].blank = FALSE;
          
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          g_assert (entries[i].title != NULL);
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        }
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      else
        {
          entries[i].key = NULL;
          entries[i].title = NULL;
          entries[i].icon = NULL;
          entries[i].blank = TRUE;
        }

      ++i;
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    }

  screen->tab_popup = meta_ui_tab_popup_new (entries, 
                                             screen->number,
                                             len,
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                                             layout.cols,
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                                             FALSE);      

  g_free (entries);
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  meta_screen_free_workspace_layout (&layout);
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  /* don't show tab popup, since proper space isn't selected yet */
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}

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void
meta_screen_focus_mouse_window (MetaScreen  *screen,
                                MetaWindow  *not_this_one)
{
  MetaWindow *window;
  Window root_return, child_return;
  int root_x_return, root_y_return;
  int win_x_return, win_y_return;
  unsigned int mask_return;
  
  if (not_this_one)
    meta_topic (META_DEBUG_FOCUS,
                "Focusing mouse window excluding %s\n", not_this_one->desc);

  meta_error_trap_push (screen->display);
  XQueryPointer (screen->display->xdisplay,
                 screen->xroot,
                 &root_return,
                 &child_return,
                 &root_x_return,
                 &root_y_return,
                 &win_x_return,
                 &win_y_return,
                 &mask_return);
  meta_error_trap_pop (screen->display, TRUE);

  window = meta_stack_get_default_focus_window_at_point (screen->stack,
                                                         screen->active_workspace,
                                                         not_this_one,
                                                         root_x_return,
                                                         root_y_return);

  /* FIXME I'm a loser on the CurrentTime front */
  if (window)
    {
      meta_topic (META_DEBUG_FOCUS,
                  "Focusing mouse window %s\n", window->desc);

      meta_window_focus (window, meta_display_get_current_time (screen->display));

      /* Also raise the window if in click-to-focus */
      if (meta_prefs_get_focus_mode () == META_FOCUS_MODE_CLICK)
        meta_window_raise (window);
    }
  else
    {
      meta_topic (META_DEBUG_FOCUS, "No mouse window to focus found\n");
    }
}

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const MetaXineramaScreenInfo*
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meta_screen_get_xinerama_for_rect (MetaScreen    *screen,
				   MetaRectangle *rect)
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{
  int i;
  int best_xinerama, xinerama_score;

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  if (screen->n_xinerama_infos == 1)
    return &screen->xinerama_infos[0];
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  best_xinerama = 0;
  xinerama_score = 0;

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  i = 0;
  while (i < screen->n_xinerama_infos)
    {
      MetaRectangle dest, screen_info;
      
      screen_info.x = screen->xinerama_infos[i].x_origin;
      screen_info.y = screen->xinerama_infos[i].y_origin;
      screen_info.width = screen->xinerama_infos[i].width;
      screen_info.height = screen->xinerama_infos[i].height;
      
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      if (meta_rectangle_intersect (&screen_info, rect, &dest))
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        {
          if (dest.width * dest.height > xinerama_score)
            {
              xinerama_score = dest.width * dest.height;
              best_xinerama = i;
            }
        }
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      ++i;
    }
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  return &screen->xinerama_infos[best_xinerama];
}

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const MetaXineramaScreenInfo*
meta_screen_get_xinerama_for_window (MetaScreen *screen,
				     MetaWindow *window)
{
  MetaRectangle window_rect;
  
  meta_window_get_outer_rect (window, &window_rect);

  return meta_screen_get_xinerama_for_rect (screen, &window_rect);
}

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const MetaXineramaScreenInfo* 
meta_screen_get_xinerama_neighbor (MetaScreen         *screen,
                                   int                 which_xinerama,
                                   MetaScreenDirection direction)
{
  MetaXineramaScreenInfo* input = screen->xinerama_infos + which_xinerama;
  MetaXineramaScreenInfo* current;
  int i;

  for (i = 0; i < screen->n_xinerama_infos; i++)
    {
      current = screen->xinerama_infos + i;

      if (((direction == META_SCREEN_RIGHT) && 
           (current->x_origin == input->x_origin + input->width) &&
           (current->y_origin >= input->y_origin) &&
           (current->y_origin <= input->y_origin+input->height)) ||
          ((direction == META_SCREEN_LEFT) && 
           (input->x_origin == current->x_origin + current->width) &&
           (current->y_origin >= input->y_origin) &&
           (current->y_origin <= input->y_origin + input->height)) ||
          ((direction == META_SCREEN_UP) && 
           (input->y_origin == current->y_origin + current->height) &&
           (current->x_origin >= input->x_origin) &&
           (current->x_origin <= input->x_origin + input->width)) ||
          ((direction == META_SCREEN_DOWN) && 
           (current->y_origin == input->y_origin + input->height) &&
           (current->x_origin >= input->x_origin) &&
           (current->x_origin <= input->x_origin + input->width)))
        {
          return current;
        }
    }
  
  return NULL;
}

void
meta_screen_get_natural_xinerama_list (MetaScreen *screen,
                                       int**       xineramas_list,
                                       int*        n_xineramas)
{
  const MetaXineramaScreenInfo* current;
  const MetaXineramaScreenInfo* tmp;
  GQueue* xinerama_queue;
  int* visited;
  int cur = 0;
  int i;

  *n_xineramas = screen->n_xinerama_infos;
  *xineramas_list = g_new (int, screen->n_xinerama_infos);

  /* we calculate a natural ordering by which to choose xineramas for
   * window placement.  We start at the current xinerama, and perform
   * a breadth-first search of the xineramas starting from that
   * xinerama.  We choose preferentially left, then right, then down,
   * then up.  The visitation order produced by this traversal is the
   * natural xinerama ordering.
   */

  visited = g_new (int, screen->n_xinerama_infos);
  for (i = 0; i < screen->n_xinerama_infos; i++)
    {
      visited[i] = FALSE;
    }

  current = meta_screen_get_current_xinerama (screen);
  xinerama_queue = g_queue_new ();
  g_queue_push_tail (xinerama_queue, (gpointer) current);
  visited[current->number] = TRUE;

  while (!g_queue_is_empty (xinerama_queue))
    {
      current = (const MetaXineramaScreenInfo*) 
        g_queue_pop_head (xinerama_queue);

      (*xineramas_list)[cur++] = current->number;

      /* enqueue each of the directions */
      tmp = meta_screen_get_xinerama_neighbor (screen,
                                               current->number,
                                               META_SCREEN_LEFT);
      if (tmp && !visited[tmp->number])
        {
          g_queue_push_tail (xinerama_queue,
                             (MetaXineramaScreenInfo*) tmp);
          visited[tmp->number] = TRUE;
        }
      tmp = meta_screen_get_xinerama_neighbor (screen,
                                               current->number,
                                               META_SCREEN_RIGHT);
      if (tmp && !visited[tmp->number])
        {
          g_queue_push_tail (xinerama_queue,
                             (MetaXineramaScreenInfo*) tmp);
          visited[tmp->number] = TRUE;
        }
      tmp = meta_screen_get_xinerama_neighbor (screen,
                                               current->number,
                                               META_SCREEN_UP);
      if (tmp && !visited[tmp->number])
        {
          g_queue_push_tail (xinerama_queue,
                             (MetaXineramaScreenInfo*) tmp);
          visited[tmp->number] = TRUE;
        }
      tmp = meta_screen_get_xinerama_neighbor (screen,
                                               current->number,